Interface to vcr index files (as created by vcrindex program)

Demo/sgi/video/VcrIndex.py

+#
+# A VCR index.
+#
+import os
+import string
+
+error='VcrIndex.error'
+VERSION_STRING='#!VcrIndex 1.1\n'
+PREV_VERSION_STRING='#!VcrIndex 1.0\n'
+
+class VcrIndex:
+	def init(self, name):
+		self.curmovie = None
+		self.curscene = None
+		self.modified = 0
+		self.filename = name
+		self.basename = os.path.basename(name)
+		self.editable = []
+		if not name:
+			self.movies = {}
+			return self
+		try:
+			fp = open(name, 'r')
+		except IOError:
+			self.movies = {}
+			return self
+		header = fp.readline()
+		if header == PREV_VERSION_STRING:
+			print 'Converting old-format database...'
+			data = fp.read(100000)
+			self.movies = eval(data)
+			for m in self.movies.keys():
+				d = self.movies[m]
+				newd = {}
+				for s in d.keys():
+					newsd = {}
+					newsd['START'] = d[s]
+					if s == 'START':
+						s = '-ALL-'
+					newd[s] = newsd
+				
+				self.movies[m] = newd
+			print 'Done.'
+			return self
+		if header <> VERSION_STRING:
+			print 'VcrIndex: incorrect version string:', header
+			self.movies = {}
+			return self
+		data = fp.read(100000)
+		self.movies = eval(data)
+		return self
+	#
+	# Save database to given file (or same file as read from if no
+	# filename given).
+	# 
+	def save(self, name):
+		if not name:
+			name = self.filename
+		if not name:
+			raise error, 'No filename given'
+		self.filename = name
+		bupname = name + '~'
+		try:
+			os.unlink(bupname)
+		except os.error:
+			pass
+		try:
+			os.rename(name, bupname)
+		except os.error:
+			pass
+		fp = open(name, 'w')
+		data = str(self.movies)
+		fp.write(VERSION_STRING)
+		fp.write(data)
+		fp.write('\n')
+		fp.close()
+		self.modified = 0
+	#
+	# Get a list of movie names in tape order
+	#
+	def get_movienames(self):
+		names = self.movies.keys()
+		sorted = []
+		for name in names:
+			sorted.append(self.movies[name]['-ALL-']['START'], name)
+		sorted.sort()
+		rv = []
+		for pos, name in sorted:
+			rv.append(name)
+		return rv
+	#
+	# Get a list of scene names in tape order
+	#
+	def get_scenenames(self):
+		if not self.curmovie:
+			return []
+		scenedict = self.movies[self.curmovie]
+		names = scenedict.keys()
+		sorted = []
+		for name in names:
+			sorted.append(scenedict[name], name)
+		sorted.sort()
+		rv = []
+		for pos, name in sorted:
+			rv.append(name)
+		return rv
+	#
+	# Get a list of scene ids (format '00:02:32:12 name') in tape order
+	#
+	def get_sceneids(self):
+		if not self.curmovie:
+			return []
+		scenedict = self.movies[self.curmovie]
+		names = scenedict.keys()
+		sorted = []
+		for name in names:
+			sorted.append(scenedict[name]['START'], name)
+		sorted.sort()
+		rv = []
+		for pos, name in sorted:
+			str = '%02d:%02d:%02d:%02d ' % pos
+			rv.append(str + name)
+		return rv
+	#
+	# Does a movie exist?
+	#
+	def movie_exists(self, name):
+		return self.movies.has_key(name)
+	#
+	# Select a movie.
+	#
+	def movie_select(self, name):
+		if not self.movies.has_key(name):
+			raise error, 'No such movie: '+name
+		self.curmovie = name
+		self.curscene = None
+	#
+	# Get movie dictionary, or raise an error if no current movie.
+	#
+	def _getmoviedict(self):
+		if not self.curmovie:
+			raise error, 'No current movie'
+		return self.movies[self.curmovie]
+	#
+	# Rename a movie.
+	#
+	def movie_rename(self, newname):
+		scenedict = self._getmoviedict()
+		if self.movie_exists(newname):
+			raise error, 'Movie already exists: '+newname
+		del self.movies[self.curmovie]
+		self.movies[newname] = scenedict
+		self.curmovie = newname
+		self.modified = 1
+	#
+	# Copy a movie.
+	#
+	def movie_copy(self, newname):
+		scenedict = self._getmoviedict()
+		if self.movie_exists(newname):
+			raise error, 'Movie already exists: '+newname
+		newdict = {}
+		for k in scenedict.keys():
+			olddata = scenedict[k]
+			newdata = {}
+			for i in olddata.keys():
+				newdata[i] = olddata[i]
+			newdict[k] = newdata
+		self.movies[newname] = newdict
+		self.curmovie = newname
+		self.modified = 1
+	#
+	# Delete a movie.
+	#
+	def movie_delete(self):
+		if not self.curmovie:
+			raise error, 'No current movie'
+		del self.movies[self.curmovie]
+		self.curmovie = None
+		self.curscene = None
+		self.modified = 1
+	#
+	# Create a new movie.
+	#
+	def movie_new(self, name, pos):
+		if self.movie_exists(name):
+			raise error, 'Movie already exists: '+name
+		newdict = {}
+		newsdict = {}
+		newsdict['START'] = pos
+		newdict['-ALL-'] = newsdict
+		self.movies[name] = newdict
+		self.curmovie = name
+		self.curscene = None
+		self.modified = 1
+	#
+	# Does a scene exist?
+	#
+	def scene_exists(self, name):
+		scenedict = self._getmoviedict()
+		return scenedict.has_key(name)
+	#
+	# Select a current scene.
+	#
+	def scene_select(self, name):
+		scenedict = self._getmoviedict()
+		if not scenedict.has_key(name):
+			raise error, 'No such scene: '+name
+		self.curscene = name
+	#
+	# Rename a scene.
+	#
+	def scene_rename(self, newname):
+		scenedict = self._getmoviedict()
+		if not self.curscene:
+			raise error, 'No current scene'
+		if scenedict.has_key(newname):
+			raise error, 'Scene already exists: '+newname
+		if self.curscene == '-ALL-':
+			raise error, 'Cannot rename -ALL-'
+		scenedict[newname] = scenedict[self.curscene]
+		del scenedict[self.curscene]
+		self.curscene = newname
+		self.modified = 1
+	#
+	# Copy a scene.
+	#
+	def scene_copy(self, newname):
+		scenedict = self._getmoviedict()
+		if not self.curscene:
+			raise error, 'No current scene'
+		if scenedict.has_key(newname):
+			raise error, 'Scene already exists: '+newname
+		scenedict[newname] = scenedict[self.curscene]
+		self.curscene = newname
+		self.modified = 1
+	#
+	# Delete a scene.
+	#
+	def scene_delete(self):
+		scenedict = self._getmoviedict()
+		if not self.curscene:
+			raise error, 'No current scene'
+		if self.curscene == '-ALL-':
+			raise error, 'Cannot delete -ALL-'
+		del scenedict[self.curscene]
+		self.curscene = None
+		self.modified = 1
+	#
+	# Add a new scene.
+	#
+	def scene_new(self, newname, pos):
+		scenedict = self._getmoviedict()
+		if scenedict.has_key(newname):
+			raise error, 'Scene already exists: '+newname
+		newdict = {}
+		newdict['START'] = pos
+		scenedict[newname] = newdict
+		self.curscene = newname
+		self.modified = 1
+	#
+	# Get scene data.
+	#
+	def _getscenedata(self):
+		scenedict = self._getmoviedict()
+		if not self.curscene:
+			raise error, 'No current scene'
+		return scenedict[self.curscene]
+	#
+	# Data manipulation routines.
+	#
+	def pos_get(self):
+		return self._getscenedata()['START']
+	#
+	def pos_set(self, pos):
+		data = self._getscenedata()
+		data['START'] = pos
+		self.modified = 1
+	#
+	def comment_get(self):
+		data = self._getscenedata()
+		if data.has_key('COMMENT'):
+			return data['COMMENT']
+		else:
+			return ''
+	#
+	def comment_set(self, comment):
+		data = self._getscenedata()
+		data['COMMENT'] = comment
+		self.modified = 1
+	#
+	# Get the scene id of the current scene.
+	#
+	def get_cursceneid(self):
+		pos = self._getscenedata()['START']
+		str = '%02d:%02d:%02d:%02d ' % pos
+		return str + self.curscene
+	#
+	# Convert a scene id to a scene name.
+	#
+	def scene_id2name(self, id):
+		pos = string.find(id, ' ')
+		if pos <= 0:
+			raise error, 'Not a scene id: '+id
+		return id[pos+1:]
+	#
+	# Select a scene given a position.
+	#
+	def pos_select(self, pos):
+		prevmovie = None
+		movies = self.get_movienames()
+		for movie in movies:
+			mpos = self.movies[movie]['-ALL-']['START']
+			if mpos > pos:
+				break
+			prevmovie = movie
+		if not prevmovie:
+			raise error, 'Scene before BOT'
+			
+		self.movie_select(prevmovie)
+		scenes = self.get_scenenames()
+		scenedict = self._getmoviedict()
+		prevscene = 'START'
+		for scene in scenes:
+			if scenedict[scene]['START'] > pos:
+				break
+			prevscene = scene
+		self.scene_select(prevscene)